Dinosaurs Found in Mass Grave Died of Drought

The abundance of allosaur fossils in the Cleveland-Lloyd Dinosaur Quarry has puzzled palaeontologists for decades, over 15,000 bones have been discovered and it believed thousands more still lay in the ground, and now a new study may have found the cause.

The Cleveland-Lloyd Dinosaur Quarry is the densest collection of Jurassic dinosaur fossils. Unlike typical Jurassic bone beds, it is dominated by the famous predatory dinosaur Allosaurus.

Since its discovery in the 1920s, numerous hypotheses have been proposed to explain the origin of the quarry. Were the dinosaurs poisoned? Did they die due to drought? Were they trapped in thick mud?

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